Island



(No Model.)

0. 0. HOWE. GRINDING MILL.

No. 527,986. Patented Oct. 23, 1894.

INVENTOH WITNESSES:

- Arron/v5 rs.

NITED STATES PATENT OFFICE.

CHARLES C. HOWE, OF WVESTERLY, ASSIGNOR TO THE SHANNOOK MICA I COMPANY,OF SHANNOOK, RHODE ISLAND.

GRINDING-MILL SPECIFICATION forming part of Letters Patent N0. 527,986,dated October 23,1894. Application filed November 10, 1893. Serial No.490,545. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES C. Hows, of

ing substances of all descriptions, but more especially for grindingmica and similar substances in a liquid.

The invention consists of certain parts and details, and combinations ofthe same, as will be fully described hereinafter and then pointed out inthe claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 is asectional side elevation of the improvement on the line 1-1of Fig. 2; and Fig. 2 is a sectional plan view of the same on the line22 of Fig. 1. i

The improved grinding-mill is provided with the tub or other receptableA, in which the grinding is carried on. The bed B, of this receptacle A,is preferably made of wood, with the grain on the end of the wood, so asto present at its upper face a hard rubbing surface. On the top of thisbed B, is held in grinding contact Withthe bed B, a muller 0, madecircular and formed in its center with an eye 0, through which thematerial can pass to the grinding surface between the bottom of themuller and the top surface of the bed B. In the eye 0' is held a socketD, loosely engaged by the wrist pin E of acrank arm E, secured to thelower end of the shaft F, arranged vertically, and journaled in suitablebearings in a framework G, erected on the reoeptable A. The upperend ofthe shaft F, preferably carries a beveled gear wheel H in mesh with abeveled pinion II, secured on the longitudinally extending shaft I,likewise journaled in the frame G, and provided with fast and loosepulleys I, connected by a belt with suitable machinery to impart arotary motion to the said shaft I, and by the pinion H and gear wheel H,to the shaft F,

O is in frictional contact with the said band K, and the muller iscarried around by the crank arm E, it will revolve, caused by the band Jrolling 0E on the ring K so that a double motion is given to the saidmuller and any point on its periphery will describe an epicycloidalcurve. 'Thus, when the crank arm E moves in the direction of the arrowto, the muller O will rotate in the direction of the arrow b, at thetime it is moved around by the said crank arm within the receptacle A.This muller in sweeping around the receptacle A on the upper surface ofthe bed B, revolves backward on its own center, so that it has a doubleeccentric motion, and consequently a larger grinding capacity. By thisarrangement the two grinding surfaces of the muller C and bed B, aresubstantially changed so that both wear perfectly uniform, and the bedwill always remain level at its upper surface.

The top surface of the muller O, is beveled outward and downward, sothat the muller in movingagainst the material readily causes the latterto travel up the beveled surface to pass into the eye 0' and to thegrinding surface of the muller and bed.

In grinding mica the muller is made of stone and runs on a hard woodbedformed of wood blocks having their grain on the end of the wood. Bythis combination of a stone muller and wooden bed, great brillianoy isgiven to the mica, as the process is more in the nature of smoothingdown or flaking the material, than grinding it.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. In a grinding mill, the combination with areceptacle having a bed inits bottom, of a muller having a central eyeand provided witha socket in said eye, and a revolving shaft providedwith a crank arm having a wristpin projecting loosely into the saidsocket to permit the muller to turn thereon, substantially as described.

2. A grinding mill comprising a receptacle having a bed, and a circularfixed band at the 5 inner surface of its side, a muller adapted to becarried around in the said receptacle and "having a bed of wood, thegrain of which is vertical, a mailer having a central eye and providedwith a socket in said eye and with an elastic band on its periphery, anda revoluble shaft provided with a crank arm having a wrist pin workingloosely in the socket ot' the muller, substantially as described.

CHARLES C. HOWE.

. Witnesses:

IRVINE O. CHESTER, S. M. FENNER.

